High Finned Tubes

Finned tubes are the most critical components of air-cooled heat exchangers, which is why they must be of the highest quality and fully meet customer specifications.

With over 45 years of experience, Airco·Fin specializes in producing all types of finned tubes, including:

L, KL, LL, G (embedded) finned tubes
High finned tubes made from a metal core with an aluminum or copper strip
Extruded finned tubes, where fins are formed directly from an aluminum tube

We guarantee top-tier quality by:

Using raw materials from trusted European suppliers
Performing rigorous quality checks at every stage of production
Ensuring every tube meets strict industry standards before shipping

Whether for air-cooled heat exchangers or other applications, our finned tubes deliver unmatched performance and reliability.

Embedded Finned Tubes: G-Fin Technology

Description:
The grooved fin is mechanically bonded into the tube wall, guaranteeing optimal heat transfer and bonding capabilities up to 400°C.

Production:
During production, a groove is precisely machined into the tube wall with a depth of 0.25 (+/- 0.05) mm. Subsequently, the aluminium strip is carefully rolled into the groove, and the groove is sealed using so called backfillers. This process effectively locks the strip in the tube wall, ensuring complete contact with the base tube, even at elevated temperatures. The result is a robust and efficient heat transfer mechanism provided by the G-FIN technology.

Max. tube wall temperature:	400°C
Base tube material	Carbon steel – stainless steel – duplex – nickel alloys – copper/copper alloys
Finning material	Aluminium – copper
Range of finning	Tube length: 200 – 22000 mm
Base tube diameter	15,88 – 50,8 mm
Finning heights	6,35 – 25,4 mm (depending on the tube OD)
Fin pitch	5 – 12 fpi
Capacity	6500 meter per day

Wrap-On Finned Tubes: L-FIN Technology

Description:
The L-shaped fin is tension-wound around the base tube, ensuring complete contact between the foot and the base tube.

Production:
In the manufacturing process, the strip undergoes pre-forming into an L-shape using a set of performer rollers. Subsequently, the strip is rolled and tension-wound around the base tube. The consecutive fins are positioned against the foot of the previous fin, providing additional protection to the base tubes.

Max. tube wall temperature:	130°C
Base tube material	Carbon steel – stainless steel – duplex – nickel alloys – copper/copper alloys - Titanium
Finning material	Aluminium of copper
Range of finning	Tube length: 200 – 22000 mm
Base tube diameter	15,88 – 50,8 mm
Finning heights	6,35 – 25,4 mm (depending on the tube OD)
Fin pitch	5 – 12 fpi
Capacity	6500 meter per day

Overlapped Footed Finned Tubes: LL-FIN Technology

Description:
The overlapped footed or double L-fin is similar to the L-fin but offers double strip thickness coverage of the base tube. This finning type serves often as an alternative to extruded finning.

Production:
The strip is pre- ormed using a two-stage preform roller set. Following this, the strip is rolled and tension-wound around the base tube. The preformed foot allows the fins to interlock on the tube surface, ensuring continuous contact with the base tube and forming a seal for protection against external corrosion.

Max. tube wall temperature:	165°C
Base tube material	Carbon steel – stainless steel – duplex – nickel alloys – copper/ copper alloys - Titanium
Finning material	Aluminium – copper
Range of finning	Tube length: 200 – 22000 mm
Base tube diameter	15,88 – 50,8 mm
Finning heights	6,35 – 15,88 mm (depending on the tube OD)
Fin pitch	5 – 12 fpi
Capacity	6500 meter per day

Knurled Footed Finned Tubes and Knurled Overlapped Footed Finned Tubes: KL-FIN & KLM-FIN Technology

Description:
The knurled fin is characterized by the knurled surface on the foot of the L- ype or LL-type finning. The knurling on both the base tube and the foot increases the surface area and bonding of the fin to the base tube.

Production:
The strip is preformed into an L or LL shape. The base tube is knurled using a knurling disc. After rolling the strip and tension wrapping it around the tube, the foot of the L or LL fin undergoes knurling as well.

Max. tube wall temperature:	250ºC
Base tube material	Carbon steel – stainless steel – duplex – nickel alloys – copper/ copper alloys - Titanium
Finning material	Aluminium – copper
Range of finning	Tube length: 200 – 22000 mm
Base tube diameter	15,88 – 50,8 mm
Finning heights	6,35 – 15,88 mm (depending on the tube OD)
Fin pitch	5 – 12 fpi
Capacity	6500 meter per day

EXTRUDED FIN (Bi-metallic)

Description:
Aluminium or copper fin formed out of a tube that is pushed over the base tubes.The complete tube is covered and if necessary a part of the unfinned end can be machined into a sleeve. This way the unfinned part behind the tube sheet is also covered with aluminium.

Production:
The base tube is degreased and pushed into the barrel. The aluminium tube is pushed in the same barrel, over the base tube. In the next step the tube will be pushed into the machine where the outer tube is formed into a fin and the aluminium is pressed on the base tube. This creates the bonding for the heat transfer from the tube into the aluminium fin.

Max. tube wall temperature:	310°C
Base tube material	Carbon steel – stainless steel – duplex – nickel alloys – copper/ copper alloys - Titanium
Finning material	Aluminium – copper (copper depending on the required fin height).
Range of finning	Tube length: 200 – 22000 mm
Base tube diameter	15,88 – 50,8 mm
Finning heights	6,35 – 15,88 mm (depending on the tube OD)
Fin pitch	5 – 12 fpi
Capacity	4500 meter per day

Years of experience in production of high finned tubes

Airco·Fin has more than 45 years of experience in the production of high finned tubes. We use this experience to continuously improve our product and to further innovate our production process where possible. Our team is happy to assist you in the design stage of the air-cooled heat exchangers with the technical possibilities. Carrying the ISO 9001 and ISO 14001 in every step of the company, we secure the high standard in quality and environmental responsibility.

More information on our high finned tubes?

Feel free to contact our team for any technical assistance in the design of the air-cooled heat exchanger and for cost calculation of the finned tubes. Our team is eager to give you the quickest answers, so you can proceed with the project.